LAUSR

Abstract The single crystal nanorods under uniaxial loading and unloading tensile with different period along crystallographic orientations [1 1 0] and axial directions being applied constant tensile rates are simulated respectively by method of molecular dynamics to elucidate the effect of periodical tensile stress and another mechanical properties of the single crystal copper within the Nano-scope. After stimulation, we compare the different features and phenomenon between the loading style of period and none of period. In the case of periodical loading, nanorods show the various maximum stress at yielding stage, and after yield, the degree of fatigue depends on the period of step heavily. Our results suggest that the mechanical character of single crystal copper nanorods is remarkably influenced by the steps of loading period when we use the maximum yield stress σ s at none of periodical loading condition as underlying reference. At the following text description, it has been expressed that the total number of loading and unloading circle may affect the mechanical response of the MD system. When the semi-periodical loading steps or the total steps of whole periodical load near to 5.1 × 103 steps (8.7 × 103 steps for the other model), the model system occurs to the Nano-scale fatigue. And the Nano-scale fatigue will lead to the yield point decreasing in turn on account of various periodical steps.